xref: /third_party/ltp/testcases/misc/math/nextafter/nextafter01.c

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/* 01/02/2003	Port to LTP	avenkat@us.ibm.com */
/* 06/30/2001	Port to Linux	nsharoff@us.ibm.com */

/*
 * NAME
 *      scalb
 *
 * CALLS
 *      nextafter(3C)
 *
 * ALGORITHM
 *	Check results from the above functions against expected values.
 *
 * RESTRICTIONS
 * 	Checks for basic functionality, nothing fancy
 */

#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "test.h"

#define	FAILED 0
#define	PASSED 1

char *TCID = "nextafter01";

int local_flag = PASSED;
int block_number;
FILE *temp;
int TST_TOTAL = 1;

void setup();
void blenter();
void blexit();

/*--------------------------------------------------------------*/
int main()
{
	double answer;
	double check;		/* tmp variable */

	setup();		/* temp file is now open */
/*--------------------------------------------------------------*/
	blenter();

	answer = nextafter(1.0, 1.1);
	check = (answer + 1.0) / 2;
	if ((check != answer) && ((float)check != 1.0)) {
		fprintf(temp, "nextafter returned %e, expected answer or 1.0\n",
			answer);
		local_flag = FAILED;
	}

	blexit();
/*--------------------------------------------------------------*/
	blenter();

	answer = nextafter(1.0, 0.9);
	if ((check != answer) && (check != 1.0)) {
		fprintf(temp, "nextafter returned %e, expected answer or 1.0\n",
			answer);
		local_flag = FAILED;
	}

	blexit();
/*--------------------------------------------------------------*/
	blenter();

	answer = nextafter(1.0, 1.0);
	if (answer != 1.0) {
		fprintf(temp, "nextafter 3 returned %e, expected 1.0\n",
			answer);
		local_flag = FAILED;
	}

	blexit();
/*--------------------------------------------------------------*/

	tst_exit();
}

/*--------------------------------------------------------------*/

/*****	*****	LTP Port	*****/

/* FUNCTIONS */

void setup()
{
	temp = stderr;
}

void blenter()
{
	local_flag = PASSED;
}

void blexit()
{
	if (local_flag == PASSED)
		tst_resm(TPASS, "Test passed");
	else
		tst_resm(TFAIL, "Test failed");
}

/*****	*****		*****/